Impression tray



July *1 119%. 1,499,344

' I. CHIGE ET AL IMPRES S I 0N 'TRAY I Filed Nov. 13, 1922 Patented July 1, 1924.

UNITED STATES ISIDOR CHIGE AND ISRAEL ZADIKOW, OF NEW YORK, N. Y.

IMPRESSION TRAY.

To all whom it may GOILGGM! Be it known that we, Isrnon Un on and ISRAEL ZADIKOW, citizens of the United States, and residents of the city, county, and

State of New York, have invented certain new and useful Improvements in Impression Trays, of which the following is a specification.

This invention relates to improvements in dental appliances known as impression trays, consisting of shallow containers pro vided with handles convenient for operation and adapted to hold a plastic substance to be inserted into the mouth for receiving an impression from the teeth or gums.

The impression material, such as refined plaster of Paris or similar substance, is of a nature that rapidly sets, that is, becomes firm and unyielding, constituting a mold adapted to receive a plastic composition in the construction of plate and bridge work suited to individual requirements.

Such trays are used in taking partial or complete impressions, for either upper or lower teeth and therefore vary in length and capacity, as may be required, from those capable of receiving a limited number of teeth to a full set.

As is well known in the art, it is not infrequent to encounter malformed, crooked or bulbulous teeth which render it difficult and often impossible to withdraw the trays after an impression has been taken without distorting the mold in separating it from the teeth, rendering it useless and compelling a repetition of the work, and if the teeth are bulbulous or seriously distorted, an accurate mold cannot be obtained.

To overcome such difliculties and ensure a perfect mold, irrespective of tooth malformations or distortions, is the principal purpose of this invention. I

Another object is in the provision of simple, cheap and eflective devices that permit lateral separation of the mold along the median line of the teeth centers in the manner of a two part flask and like it, capable of being closed together after removal providing a complete and accurate impression without distortion or damage in the slight est degree.

A further aim is to provide sectional devices, in number as may be required and which when combined produce a mold of any desired size.

Application filedNovember 13, 1922. Serial No. 600,756.

These objects, which tend to simplify and render easier and more accurate the work of an operator, are attained by the novel construction, combination and arrangement of parts hereinafter described and shown in the accompanying drawing, forming a ma. terial part of this disclosure, and in which I r e i c Figure 1 is a plan view of one iorrn of impression tray illustrating the cells which constitute the invention.

Figure 2 is a sectional view taken on line 22 of Figure 1. r a c Figure 3 is a plan view of another form of tray showing the cell arrangement.

Figure l is a similar view indicating a different arrangement of sectional cell s.

Figure 5 is another like view illustrating a further disposition of the cells,

Impression trays, as known in the art, are made from metal, either cast or die formed from sheet stock, shaped in accordance with the demands for either-whole or partial sets,

are of various sizes and furnished with han.-. dles to be easily operated.

The tray, shown in Figs. 1 and 2' consists of flat base 10 generally curved inp'rofile at its outer and inner edges with angularly convergent ends as shown.

Formed with the curved edges are raised angularly disposed flanges or side walls 11 and 12, respectively outer and inner, these outwardly bevelled walls being relatively low and having level upper edges, there being no walls at the ends.

A handle 13 is engaged in any approved manner with the lower surface of the base plate 10, this handle being relatively flat, shaped as preferred and maybe provided with an opening 14 by which it may be suspended when not in use.

In Figs. 3, 4 and 5, the tray, generally designated by the numeral 15, is shown as made of cast metal, as Britannia, full fashioned for either the upper or lower jaw, having raised inner and outer walls 16 and 17 respectively, and extending from the front curved portion of the tray is a handle 18 having an opening 19. I

These trays are filled with a quick setting plastic material as refined plaster of Paris It will be apparent that if the tooth or part molded be larger at its outer end than at the part protruding from the gum, the mold edges will be broken or displaced so that a true cast is unobtainable.

To avoid this the present invention includes the use of supplementary shallow pans as shown in the drawing.

By referring to Figs. 1 and 2 those pans may be seen arranged in pairs, having flat bases 20, low raised adjacent walls 21 arranged at right angles to the base and outwardly bevelled walls 22 suited to be closely received within the corresponding walls 11 and 12 of the tray, these outer walls being curved and in all respects conforming to walls of the tray.

In addition to the pans resting on the base lO of the tray they may be provided with re-entrantly turned, hook-like projections 23 adapted to engage over the edges of the side Walls of the trays as shown.

The full size trays as shown in Figs. 3, 4c and 5 are preferably provided with pans made in sections, adjoining at their ends, the lines of demarcation being indicated by the numerals 24eas shown in Fig. 3 where two sections are used, 25 in Fig. l, three sections being indicated, or 26 in Fig. 5 where four sections are illustrated.

In operation, thepans are placed in the trays, filled with the plastic material to constitute a mold 30, the bite taken and the tray removed leaving the pans adhering to the teeth after partially setting of the plaster.

The remainder ofthe operation will be apparent, it being only necessary to separate the pans along the line 27 in Figs. 1 and 2 or the corresponding curved lines 28in Figs. 3,4 and 6, the section breaking also on lines 24, 25 and 26 coincidentally, thus clearing the protruding teeth by lateral cleavage without damage or fracture of the mold.

After removal, these several pairs ofpans and their contents are re arranged within the tray, forming a complete and perfect mold.

From the foregoing it will be seen that a simple device for this purpose has been dis closed in the preferred form of its embodiment, but it is not desired to restrict the details to the exact construction shown, it being obvious that changes, not involving the exercise of invention, may be made without con fiicting with the scope of the appended claims.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent, is

L An impression tray comprising a channelled body having outwardly inclined walls, paired cells fitting the channel in said body, the adjacent walls of said cells meeting ap proximatelyat the center lengthwise of the channel, and hook shaped clips formed with the edges of the outer walls of said cells engageable with the corresponding walls of said body both interiorly and eXteriorly of said body. I

2. In an impression tray having a sectional mold formed therein, a plurality of sectional pans or cells intermediate the mold and tray walls, separable from said tray walls, and re-entrantly turned, hook-shaped clips formed with the edges of the outer walls of said pans engageable over the edges 7 of the side walls of said tray.

In testimony whereof we have signed'our names to this specification.

ISIDOR onion. ISRAEL ZADIKOW. 

